Polymer, coating composition comprising same, and organic light-emitting device using same

1. A polymer comprising a unit represented by the following Chemical Formula 1:

wherein, in Chemical Formula 1,

Ar1 to Ar5 are the same as or different from each other, and each independently a substituted or unsubstituted aryl group;

Ar2 and Ar3 are optionally bond to each other to form a substituted or unsubstituted heteroring;

Ar4 and Ar5 are optionally bond to each other to form a substituted or unsubstituted heteroring;

L1 and L2 are the same as or different from each other, and each independently a direct bond; or a substituted or unsubstituted arylene group;

Y is (Y2) i -Y3-;

Y3 is a substituted or unsubstituted arylene group; or a substituted or unsubstituted alkylene group;

each Y2 is independently a substituted or unsubstituted arylene group; a substituted or unsubstituted alkylene group; or —O—;

i is an integer of 1 to 8, and when i is 2 or greater, Y2s are the same as or different from each other, and (Y2) i contains at least one —O—;

R1 to R5 are the same as or different from each other, and each independently hydrogen, or a substituted or unsubstituted alkyl group; and

l and k are the same as or different from each other, and each independently an integer of 0 to 3, and when 1 is 2 or greater, R1s are the same as or different from each other, and when k is 2 or greater, R2s are the same as or different from each other.

2. The polymer of claim 1 , wherein the polymer including the unit represented by Chemical Formula 1 has a number average molecular weight of 1,000 g/mol to 300,000 g/mol.

3. The polymer of claim 1 , wherein Ar1 to Ar5 are the same as or different from each other, and each independently a substituted or unsubstituted phenyl group; a substituted or unsubstituted biphenyl group; or a substituted or unsubstituted fluorene group.

4. The polymer of claim 1 , wherein L1 and L2 are the same as or different from each other, and each independently a direct bond; or a phenylene group.

5. The polymer of claim 1 , wherein Y3 is a substituted or unsubstituted phenylene group; or a substituted or unsubstituted biphenylylene group; and

Y2s are the same as or different from each other, and each independently a substituted or unsubstituted phenylene group; a substituted or unsubstituted biphenylylene group; a substituted or unsubstituted methylene group; a substituted or unsubstituted ethylene group; a substituted or unsubstituted propylene group; a substituted or unsubstituted butylene group; a substituted or unsubstituted pentylene group; a substituted or unsubstituted hexylene group; or —O—.

6. The polymer of claim 1 , wherein Y is selected from among the following structural formulae:

in the structural formulae, R and R′ are the same as or different from each other, and each independently a substituted or unsubstituted alkylene group.

7. The polymer of claim 6 , wherein R and R′ are the same as or different from each other, and each independently a methylene group; an ethylene group; a propylene group; a butylene group; a pentylene group; or a hexylene group.

8. The polymer of claim 1 , wherein the polymer including the unit represented by Chemical Formula 1 is selected from among the following structural formulae:

in the structural formulae, n is the number of a repetition unit, and is from 10 to 1000; and

an end group of the polymer is hydrogen; a substituted or unsubstituted alkyl group; or a substituted or unsubstituted aryl group.

9. A coating composition comprising the polymer of claim 1 .

10. The coating composition of claim 9 , which is for an organic light emitting device.

11. An organic light emitting device comprising:

a first electrode;

a second electrode provided opposite to the first electrode; and

at least one organic material layer provided between the first electrode and the second electrode,

wherein the at least one organic material layer includes the coating composition of claim 9 .

12. The organic light emitting device of claim 11 , wherein the at least one organic material layer including the coating composition is a hole transfer layer, a hole injection layer, or a layer carrying out hole transfer and hole injection at the same time.

13. The organic light emitting device of claim 12 , wherein the coating composition further includes a p-doping material.

14. The organic light emitting device of claim 13 , wherein the p-doping material includes a boron anion or

15. The coating composition of claim 9 , further comprising a solvent wherein the solvent has a boiling point of 40° C. to 250° C., and a viscosity of from 1 cp to 10 cp.

16. The coating composition of claim 9 , wherein the polymer including the unit represented by Chemical Formula 1 in the coating composition has a concentration of 0.1 wt/v % to 20 wt/v %.

17. The polymer of claim 1 , wherein Ar1 is a phenyl group unsubstituted or substituted with a halogen group, an alkyl group or an arylamine group; a biphenyl group unsubstituted or substituted with an arylamine group; or a fluorene group unsubstituted or substituted with an alkyl group.

18. The polymer of claim 1 , wherein Ar2 to Ar5 are the same as or different from each other, and each independently a phenyl group unsubstituted or substituted with an arylamine group; a biphenyl group unsubstituted or substituted with an arylamine group; or a fluorene group unsubstituted or substituted with an alkyl group, or Ar2 and Ar3 bond to form a carbazole ring, and Ar4 and Ar5 bond to form a carbazole group.

19. A method for manufacturing an organic light emitting device, the method comprising:

preparing a substrate;

forming a cathode or an anode on the substrate;

forming one or more organic material layers on the cathode or the anode; and

forming an anode or a cathode on the one or more organic material layers, wherein the one or more organic material layers are formed using the coating composition of claim 9 .

20. The method of claim 19 , wherein the forming of the one or more organic material layers using the coating composition comprises coating the coating composition on the cathode or the anode; and heat treating the coated coating composition.